Screening mill



l C. F. SCHUTTE ET AL SCREENING MILL Aug. 3l, 1943.

Filed Nov. 12, 1941 2 Sheets-Sheet 1 BY ,M

INVE

ATTORNEYS Augi 31, 1,943. c. SCHUTTE ET AL 2,328,170

SCREENING MILL gun? Byiarmanhschutko., @..Mmudyv ATTORNEYS i L @Hummm screenfineimbers mherenm viele`` an improved pulverize'r or the( hammer muy A typemhaving improvedmensineorporated therein ffriiriounting the: preduet sizing fsijreenmem;

Ber thereof, #Another object `of the invention-is anner. Another fphjebt'foff 2 xi ndfifior h o h Y h A r i ers" an?" imprvd [means ifror mouritih fexehangeahle" y hammers I8-to receive thefmajorityfoff'thewear Jeetje; theiufrvemionis wprovide e mur of; me

chrterdesexibedheving'enimprovecarrngef meng rqrdquiclsly andeasny 'exchanging predire@ screening A*niexrzers\r thereof iso as" `to fgrade*thev u dbieo vor the mventibniswopibvideamillf i thepuroses set forthhereinlabove wherein the p roeciure of-Lexchangingthe screen members;

' sereenwmember thereof shown `in ing mechanism thereof; x

" ofrugpr;

inl oqnnectioriywith=fproees$ing 'offthe inilluffeed'.`

al1-clelia erably` fre finie. as ,may l required.

arrangement 'as is iiiustratetifby Fig; i tf the ,present drawing. However, the-prior art.arrange'-v y i. ments usuallyA 'involve in addition` some, provision vfor .dropping theA screen memberV downwardly away 'from operative positionl preliminary to rel moval'of the screen member-.from the rnill frame in connection wthuscreen exchange procedures as arerequired 'to turnout products ofV various specications. Such varrangements have invaria-V bly involved the vuse of .relatively complicated screen supporlt'arrdexchange devices; the use of.

- which usually requires the rnill to be stopped before 4the screen'fmembers may be exchanged,-

. `and through use of which the timerequiredfor j screen exchange is very; substantial. In: any

- of the ledges'. The screen positioning and locli- Y. ing mechanism of the invention is then brought' Vintoaction'to complete the installation of the CII case,1the necessary procedure for exchangingI the i "screening elements of Vsuch prior art niillsre-A Vquires substantialtime losses and is accompanied by substantial mechanical difficulties 'andiincon j.

veniences or other disadvantages.

"In accord vwith the present invention theop- "posite side wallfportionso'f the b'aseffranie l@ arer provided rfwith l inwardly'extending ledges 36j` screenm'ember in operative position.

The'positioningand locking meinberj comprises essentially alever device including a forward blade portion'E-having a'h'andle 52 Vex-Y tending rearwardly therefrom. n lheforward edge' of the bladegll is formed with a'beaded nose 5d so as to lengage in roller bearing 4contact rela. v'tionbeneath a laterally? extending flange portion 56 of the screen." t will be understood that 4the flange yportion 55 ofthe screen maybe convenientlyprovided bymargining the trailing endV portion of the screen with a stockangle iron, as

illustrated inZ theurawings, or by simpiytuming a ilange on the end of thes'cree'n plate, or by any other suitable means. The blade of the locking Y device is iormedto extend rearwardlyinto a heel whichv are of substantiallycircularform ein" Side viewfandA disposed concentr'callyfof Ythe Ycenter of rotation of the'rotor-hammer-funit. YA second set'of ginwardly extending ledges 38 lare arranged to extend inwardlS/"froin the side wall* portionsI of ther'baseV frame 'and are 'arranged' insub'stanr f tial parallelism writh-4 and areV relatively yclosely spaced relative lto the corresponding ledgesi';` irr Ythe region of the rearA half of the mill.. Thus," a v relativelynarrowispace as 'indi'cated at'djis provided lbetween the-corresponding ledge 'niem-V portion tnereorforslide-fitting reception or the engage against fthey heel portion o fthev bladert` Vat oppositesides thereo'-in suchfnianner asto positively Positionthejblade Eli infrelation to its distance from trie 111111,11 The bracket `portiers V624-62 vare diagonally ...disposed in plan '.,view 'as illustrated'in Fig, Y3 to co'operatehwith suitably .cut'endjportons tsj-.t4 ytithe made coin such' portion 58 which is adapted to be brought to bear V downwardly upon a'xededge portion of the mill'casing." lThus the rear end `of the 'handle 5 2 maybe thereupon pressed 'downwardly 'so vasQto rotate the Ynosejend 541 of thetblade upwardly,v while at the saine Ytime the blade is pushed .in'the direction of the Ymill so that thetr'ailihg end por-1 tion` of the;s'creen is thereby rnoved against the` elastic force thereof-seas to move Vfrom the solid I lineposition thereof o'iFig. 5gtoward thebroke`n vline positionthereof, whereupon Ythe screen merrie ber 34, will be disposed entirely'against the ledges .Iv 36%36 throughout the length of the screen.'

' :A gudebracket EZ'is lprox'llidedto extend fron'if the fixed ledgeportion Eilat each fttheoppof" site sides Voffthe mill so fas .to kbe]'adenotedto u manner'that the brackets l(i2- 8'2"'function simulto4 'diverge'rornithe'positions of the correspondl-y l f ing ledgemembers'so asi'toprovideavunnek liliespace as indicatedl2 (Figsl'andg'lbetween VAcorresponClingfoi the ledgesSl--dwithin 1 wnicnftne correspending)end portion"ForVK therk screenjnembpl i's freeto movein directions radially oftha'xisfoi rotor rotation. V'lhe screen men'iberl-lgis :forme/d to, be of*v resilientv nature and to` have a 'tendenoy'fto""set"inja curvature f' 'having a'v radius "substantiallylarger" than tljiel V4radius'off'fthe orbit of theharrirernill rotation ,v 'Thusfa'n'y oneof a nurrlbeij'o'ft e'fscreen mer'f.

bers 34 of theiventitnis" adaptdtobe selen; ed f and mounted singly`within the"millgbywiniti'allyil y disposing it inpiclr-a-,back-relationupon tlneica's-VY f "finge Wall 37,2v vvasf i1lu'strated byV Vbrokenl lnesrjunf Fig-"1, f 'Iheri`tlie`lowerj endzofthe 'screenmem jber'.y is'` inserted;Y int"`t 'efiunnel-like' *sr'iaces- Vbe-v 1 tween thelledges y,3fi-/A-il.,iwhereup'on the screenV e meinteiinay be. sind 'dpwnwaruiyfandpnuer lthe d rotor, harnineras'seniblyfas itsfleadng` end por-1" n 'tionv-processes lrearwaiidlypf "thegmill vv'and ,is l guided between thecloselyV spacedfledgesltia f inte 1 arial operative position-f kDuring this tmf j tial 'installation procedure the trailing! end portion of the.screen'idgfwill of 'course-bear away Y from the interesseert-36; are" to 'the here, encyof the screenwrnernber ltogfnormally setat a' curvaturesomewhat; j iatter, than" the" curvature y taneously to positionjthebladefin directionsz'to y Y andl frorn thelmilland indiretions',laterally thereof. j

VmApairV of side arms garemounted to: extend inA spaced.relationjforwardly;offthe millgcasing Y and to,Y carry f atl'therf ends [a transverse .bar 68 1 upon ,\1vhicl1gis-"mounted1 a{:'clamp 'llilphaving an upper end "portion adapted to clamp over-theyv handle V52 of the screen lock blade' soas'vto prevent the bladef' from rotating outfofengage- VVmen'tbehindthe brackets whilethemill is in. f operation.Y The clamp r'carries a Ysert screw 112 Y arranged to bemanually adjusted Yby meansof `a g knob 14, wherebyuponlnal vclamping .of `Vthe` screen Sil-in operativetposition the clamp 'lil may be rrnly locked against unintended' idi'sengage`` ment from the' blade'handle52.

`'Ihusgritwill be understoodhat whenevenitY` Y rbecomes necessary to exchange lthe screen; ofl the' Y milll thelocking clamp 10 willffi'rstbe disengaged,

' and the screen withdrawn by simplylifting Vit upg.z

Yfrom the yhandle 5L.; thevhandle'? willthen be"` y liitedasto the solid linenpositionfoiffFigl whereupon the"adjacentendofrthescreen 3.4 will rnove into the funnel-like ispacef between th? `opposed "may thenl be grasped bythe operator-ofi themill wardly asto the brok'cnflne positionthereof in' s Fig.. 1,' whereupon the; screen-T may'be; removed `Lcompletelyfrom the mill and asubstitute screenv 4f respect to said rotor vorbitand lever means adaptedto engage beneath; andactuate the yother end` portionfof said screengupwardly andintotsimii Y larlyrbacedlrelaton with respectif?"saidfrotor orbit against the elastic -forcepf saidfSCreen', said lever ,devica comprising a spade-like member havingv a-plate portion vvithjavv rounded nose adapted to engage beneath,a; 1aterally 'fflanged end portionV of'said screen and awplate heel portion adapted, to*` bearfupon said fframegandfa handle .,pQrtonveXtending; rearwardly therefrom n Y of ssaid rotor, a yseini-cylindrical'(screen member,

1 formed of ,elastic material rto -liavela natural set in' a ourvature'ofy aeradius VAgreatertllanthe radius of. -said rotor` orbit-, mearisfor cantilevenmountfor levering said screen.intoope'rativeposition,

and 'bracketA means `extendingfirom said rfratrie for cooperation with said .plate Vheelv portion tov position said lever member-relative to saidl frame duringllfsaid :levering operationp-,Wherebyjsaid Y leverdevice may be' removed to providel ascreen. removal opening and to simultaneously permit yingone endV portion^ofgsaid screen upon sai/d'V :frame in predetermined* -spaced'relatiori witlrr re: Y

spect to said rotorforbit, and lever means adaptedY to engage .beneath andfactfuate tn'enother end portion ofk said Yscreen'upntlardlyfand into similarly spaced relation with. respect to said'rotor orbit against the elastic force of said screen, nsaid lever deviceV comprising a spade-likemember having la 'l plate portion! withafrounded nose adapted to:YV

engagebeneath aalaterally flanged end portionroff` said screen and; a 'plate heel portion Vjadapted to bear upon'said frame' andV a vhandle portion ex-A tendingrearwardly therefromfor levering said screen into operative position, and bracket means said-tscreen to becomeerelaxedffintofree sliding condition relative Y toy said mounting means and relativeitosaidcover so. astobe readily slipped out of'fsaid removal opening,V and arcuately up-l wardly over G said thereonjj ,Y4. In"- a,screeningmillalower'frame member supportinga hammer mill rotor thereon,` aA cover member kiof generally 'circular sectional form mounted uponsaid'frame tocomplete enclosure of saidmillysaid cover being of asectionalcurva@v ture of greater radius than'the radius ofthe orbitV cover' in pickaback relation f extending. from said .frame for cooperation Vwith l saidk platev 'heel Y portion: to position said lever member relative .tosaid frame during said levering operationysaid. bracket members being-disv posed diagonally of the, axisY ofvgsaid'lmilLand yCHARLES D. SCHUTTE. 'j 

